锻压技术

新型模具制取变强度制件及其力学性能研究

英文标题：Producing hot stamping parts with variable strengths by a new die and study on mechanical properties of stamping parts

作者：包丽谷泉蔡有杰吴志东刘萌刘尚

单位：齐齐哈尔大学辽宁科技学院

关键词：新型模具热冲压变强度制件力学性能有限元模拟

分类号：TG142.33

出版年,卷(期):页码：2017,42(9):123-128

摘要：

设计出利用感应加热方式形成变强度制件的热冲压新型分区模具，进行了热-流-固耦合场的理论分析，建立了热-力耦合有限元模型，得到了板料在热冲压过程中温度和维氏硬度的分布。仿真结果表明，当模具感应加热端温度升至400 ℃时，加热端的冷却速度为13.6 ℃·s-1，冷却速度决定了板料不同温区的微观组织和维氏硬度。利用该模具进行了热冲压实验，对不同温区的微观组织和维氏硬度进行检测。结果表明：该模具可冲压不同高温区(低强度)形状的制件。制件高温区已经基本转化为贝氏体组织，过渡区转化为马氏体、贝氏体和铁素体多相混合组织，低温区转化为板条状马氏体组织。设计出的新型分区模具可以获得变强度制件，为成形复杂变强度零件和工艺参数的优化提供了依据。

A new type of hot stamping partition die was designed to form parts with variable strengths by induction heating, and the thermal fluid solid coupling theory analysis was carried out. Then, the finite element model with thermal mechanical coupling was established, and the temperature and Vickers hardness distributions of sheet metal in hot stamping were obtained. The simulation results show that the cooling rate of heating die is 13.6 ℃·s-1 when the temperature of induction heating end of the die raises to 400 ℃, so the microstructure and Vickers hardness of sheet metal at different temperatures are determined by different cooling rates. Furthermore, the hot stamping experiments are carried out by the die, and the microstructure and Vickers hardness at different temperatures regions are examined. The results show that the new die can form parts with high temperature zone （low strength）, and the bainite microstructure of stamping parts is transformed from the high temperature zone, the martensite as well as bainite and ferrite multiphase mixed microstructures are transformed from the transition zone respectively, the lath-shape martensite is transformed from low temperature region. The new hot stamping die can obtain stamping parts with variable strengths and provides the basis for obtaining stamping parts with variable strength and the optimization of process parameters.

基金项目：

黑龙江省教育厅基本业务专项理工青年骨干项目（135109310）

包丽（1984-），女，博士，副教授 E-mail：bl19841222@163.com

参考文献：

［1］Merklein M, Lechler J, Stoehr T. Investigations on the thermal behavior of ultra high strength boron manganese steels within hot stamping[J]. International Journal of Material Forming, 2009, 2(1):259-262.

［2］George R, Bardelcik A, Worswick M J. Hot forming of boron steels using heated and cooled tooling for tailored properties[J]. Journal of Materials Processing Technology, 2012, 212(11):2386-2399.

［3］王世魁. 变强度冲压件热成形关键技术研究[D]. 哈尔滨：哈尔滨工业大学, 2014.

Wang S K. Research on Key Technologies of Thermal Forming of Variable Strength Stamping parts[D]. Harbin: Harbin Institute of Technology,2014.

［4］赵运运, 李亨, 李明,等. 汽车B柱高强度钢热冲压工艺[J]. 锻压技术, 2017, 42(2):66-71.

Zhao Y Y，Li H，Li M, et al. Hot stamping process of high-strength-steel for automotive B-pillar[J]. Forging ＆ Stamping Technology, 2017, 42(2):66-71.

［5］Cui J, Lei C, Xing Z, et al. Microstructure distribution and mechanical properties prediction of boron alloy during hot forming using FE simulation[J]. Materials Science & Engineering A, 2012, 535(4):241-251.

［6］Bok H H, Lee M G, Pavlina E J, et al. Comparative study of the prediction of microstructure and mechanical properties for a hot-stamped B-pillar reinforcing part[J]. International Journal of Mechanical Sciences, 2011, 53(9):744-752.

［7］高云凯，邓有志，曹伟. 超高强度钢车身B柱加强板热成形工艺参数多目标优化[J]. 中国机械工程，2011,22 (5) :621-624.

Gao Y K，Deng Y Z，Cao W. Multi-objective optimization for ultra-high strength steel B－pillar of car body hot forming process parameters[J].China Mechanical Engineering，2011，22 (5) :621-624.

［8］陈辉，景财年.热成形技术在汽车轻量化中的应用与发展[J].金属热处理，2016，41(3): 61-66.

Chen H，Jing C N.Application and development of hot forming technology for automobile lightening[J].Heat Treatment of Metals，2016,41 (3): 61-66.

［9］王敏，奚建胜，张春. 硼钢板热冲压过程马氏体相变预测[J].塑性工程学报, 2016,23(5):120-125.

Wang M, Xi J S, Zhang C. Prediction of martensitic transformation in hot forming of boron steel sheet [J]. Journal of Plasticity Engineering,2016, 23(5):120-125.

［10］刘硕, 李小平, 彭成允,等. 基于ABAQUS曲底槽型件热冲压成形模拟分析[J]. 锻压技术, 2015, 40(5):74-79.

Liu S，Li X P，Peng C Y. Simulation analysis on the hot stamping of groove parts with curved bottom based on ABAQUS[J]. Forging ＆ Stamping Technology, 2015, 40（5）: 74-79.

［11］Cui J, Lei C, Xing Z, et al. Predictions of the mechanical properties and microstructure evolution of high strength steel in hot stamping[J]. Journal of Materials Engineering & Performance, 2012, 21(11):2244-2254.

［12］Liu H, Liu W, Bao J, et al. Numerical and experimental investigation into hot forming of ultra high strength steel sheet[J]. Journal of Materials Engineering & Performance, 2011, 20(1):1-10.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】